association_klass

# File activerecord/lib/active_record/associations/preloader.rb, line 158
      def association_klass(reflection, record)
        if reflection.macro == :belongs_to && reflection.options[:polymorphic]
          klass = record.send(reflection.foreign_type)
          klass && klass.constantize
        else
          reflection.klass
        end
      end